Java tutorial
/* * #%L * asio server * %% * Copyright (C) 2013 - 2015 Research Group Scientific Computing, University of Vienna * %% * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * #L% */ package at.ac.univie.isc.asio.security; import com.google.common.collect.ImmutableSet; import com.google.common.collect.Iterables; import org.slf4j.Logger; import org.springframework.security.core.GrantedAuthority; import org.springframework.security.core.authority.GrantedAuthoritiesContainer; import org.springframework.security.core.authority.mapping.GrantedAuthoritiesMapper; import java.util.Collection; import java.util.Set; import static org.slf4j.LoggerFactory.getLogger; /** * Map authorities by expanding all {@link org.springframework.security.core.authority.GrantedAuthoritiesContainer} * to their contained authorities. */ public final class ExpandAuthoritiesContainer implements GrantedAuthoritiesMapper { private static final Logger log = getLogger(ExpandAuthoritiesContainer.class); private ExpandAuthoritiesContainer() { } public static ExpandAuthoritiesContainer instance() { return new ExpandAuthoritiesContainer(); } /** * Map all {@link org.springframework.security.core.authority.GrantedAuthoritiesContainer authority container} * to themselves and their contained authorities. * Only first level members are expanded, i.e. nested containers are not supported. * * @param authorities source authorities * @return authorities plus all contained ones */ @Override public Set<GrantedAuthority> mapAuthorities(final Collection<? extends GrantedAuthority> authorities) { final ImmutableSet.Builder<GrantedAuthority> mapped = ImmutableSet.builder(); mapped.addAll(authorities); for (final GrantedAuthoritiesContainer container : Iterables.filter(authorities, GrantedAuthoritiesContainer.class)) { for (final GrantedAuthority each : container.getGrantedAuthorities()) { mapped.add(each); } } final ImmutableSet<GrantedAuthority> result = mapped.build(); log.debug("mapped source authority containers {} to contained authorities {}", authorities, result); return result; } }